In answer to the question about the willow rooting through the liner - it should not be a problem since there will be a cement bottom, thus the roots will not be able to reach the liner.

Here are few pics. Two liner rolls. One is just over 3,000 pounds and the other one is over 7,000 lbs and about 7' tall. The plan is to seam them together this Tuesday. I will then start on the dock and cement work.

http://i819.photobucket.com/albums/zz112/langstrum1/Pond%
202010/Liner/P1010148.jpg

http://i819.photobucket.com/albums/zz112/langstrum1/Pond%202010/Liner/P1010163.jpg

http://i819.photobucket.com/albums/zz112/langstrum1/Pond%202010/Liner/P1010189.jpg

http://i819.photobucket.com/albums/zz112/langstrum1/Pond%202010/Liner/P1010190.jpg